WO2009032555A2 - Platform noise mitigation method using balanced antenna - Google Patents
Platform noise mitigation method using balanced antenna Download PDFInfo
- Publication number
- WO2009032555A2 WO2009032555A2 PCT/US2008/073971 US2008073971W WO2009032555A2 WO 2009032555 A2 WO2009032555 A2 WO 2009032555A2 US 2008073971 W US2008073971 W US 2008073971W WO 2009032555 A2 WO2009032555 A2 WO 2009032555A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- antenna
- cable
- mobile device
- balanced
- wireless mobile
- Prior art date
Links
- 230000000116 mitigating effect Effects 0.000 title description 27
- 238000000034 method Methods 0.000 title description 2
- 239000004973 liquid crystal related substance Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims 1
- 239000004020 conductor Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
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- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced lines or devices with unbalanced lines or devices
- H01P5/1007—Microstrip transitions to Slotline or finline
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2258—Supports; Mounting means by structural association with other equipment or articles used with computer equipment
- H01Q1/2266—Supports; Mounting means by structural association with other equipment or articles used with computer equipment disposed inside the computer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3827—Portable transceivers
Definitions
- This application relates to antennas and, more particularly, to antenna operation in wireless mobile devices.
- the performance of wireless communication is highly dependent on the platform noise level of the communicating devices. Both the system board and display are known sources of platform noise in mobile devices. The range and throughput of the devices are largely determined by the signal-to-noise ratio (SNR), no matter what modulation scheme is used.
- SNR signal-to-noise ratio
- An antenna connected to the wireless mobile device picks up noise from the device platform, adversely affecting the wireless communication by the device.
- Clock signals, a source of electromagnetic interference (EMI) may be received by the antenna, as may other signals transmitted within the device.
- a conventional antenna system uses an unbalanced antenna with large ground plane, as depicted in Figure 1 .
- the ground plane is a part of a radiating element, which collects the platform noise extensively.
- the conventional unbalanced antenna radiation/reception occurs from not only the antenna/ground plane element but also from a radio frequency (RF) interconnection cable, which is usually embedded inside the wireless mobile platform, due to the unbalanced feeding of the antenna.
- RF radio frequency
- Figure 1 is a schematic diagram of an unbalanced planar inverted F-shaped antenna, according to the prior art
- Figure 2 is a schematic diagram of a mobile noise mitigation system, according to some embodiments
- Figure 3 is a schematic diagram of a balanced dipole antenna used in the mobile noise mitigation system of Figure 2 for wireless internet connection, according to some embodiments;
- Figure 4 is a schematic diagram of a balanced bowtie dipole antenna, used in the mobile noise mitigation system of Figure 2 for digital television, according to some embodiments;
- Figure 5 is a schematic diagram of a second balanced bowtie dipole antenna connected to a commercially available balun, used in the mobile noise mitigation system of Figure 2 for digital television, according to some embodiments;
- Figure 6 is a frequency versus noise graph, comparing the unbalanced antenna of Figure 1 with the balanced dipole antenna of Figure 3, according to some embodiments;
- Figure 7 is a noise power measurement configuration for testing the DTV antenna of Figure 3 integrated into the mobile noise mitigation system of Figure 2, according to some embodiments.
- Figure 8 is a frequency versus noise graph, comparing the unbalanced antenna of Figure 1 with the balanced bowtie dipole antenna of Figure 4, according to some embodiments.
- a balanced antenna is integrated into a wireless mobile device for noise mitigation.
- the wireless mobile device may be a laptop computer, as one example.
- a balanced dipole antenna is placed inside the laptop computer for wireless internet connection.
- the antenna is connected to a radio frequency (RF) interconnection cable, such as a coaxial cable.
- RF radio frequency
- a balun is disposed between the antenna and the cable.
- a balanced bowtie dipole antenna is placed inside the laptop computer for digital television support. Again, a balun is used to balance the antenna with the RF interconnection cable.
- FIG. 1 is a depiction of a prior art planar inverted F-shaped antenna (PIFA) system 70, known also herein as antenna 70.
- the antenna 70 includes an antenna element 72 and a ground plane 74.
- the antenna 70 is an example of an unbalanced antenna.
- the antenna element 72 is F-shaped, with teeth 84, 86, and 88, the last of which is connected to the ground plane 74.
- the antenna 70 is connected to an unbalanced coaxial cable 76 having an outer conductor 82 and an inner conductor 78, where the coaxial cable 76 is connected to a transmitter, a receiver, or a combination transmitter/receiver (not shown).
- the outer conductor 82 is connected to the ground plane 74 of the antenna 70 while the inner conductor 78 is connected to the tooth 86 of the antenna element 72.
- the ground plane 74 of the antenna 70 may radiate as well.
- the signal-to-noise ratio (SNR) is lowered, resulting in a diminishment of range and throughput by the antenna 70.
- the antenna 70 and coaxial cable 76 are positioned without consideration of the noise effect from the motherboard (also known as the system board) and the video display. Such positioning is not successful with a wireless mobile device, as the antenna/ground plane/interconnect cables collect noise, resulting in performance degradation.
- the antenna 70 Because of the sources of noise (most notably, the motherboard and the display), positioning the antenna 70 internally within the wireless mobile device, is thus generally unsuccessful.
- display devices such as liquid crystal display (LCD) systems cause noise to be collected by the coaxial cable 76 as well as from the antenna element 72.
- the noise level of the motherboard and LCD reduces the SNR such that the transmitter, receiver, or transmitter/receiver connected to the antenna 70 is capable of processing only very high-power signals.
- FIG. 2 is a schematic diagram of a mobile noise mitigation system 100, according to some embodiments.
- the mobile noise mitigation system 100 includes a wireless mobile device 20 and an internal antenna system 200.
- the wireless mobile device 20 appears to be a laptop computer, but may also be one of many types of wireless mobile devices, including, but not limited to, personal digital assistants (PDAs), ultra mobile personal computers (UMPCs), mobile internet devices (MIDs), and cellular telephones.
- PDAs personal digital assistants
- UMPCs ultra mobile personal computers
- MIDs mobile internet devices
- cellular telephones cellular telephones.
- the wireless mobile device 20 of Figure 2 includes a display 22, such as a liquid crystal display (LCD).
- the internal antenna system 200 includes an antenna 50, a radio frequency (RF) interconnection cable 24, and a balun 40.
- the internal antenna system 200 transmits and receives wireless signals from and to the wireless mobile device 20.
- the antenna 50 may actually be disposed beneath the housing of the device.
- the antenna 50 may be positioned above the display 22, below the display, such as between the display and the motherboard (e.g., at the joint between the base of the laptop and the display), on either side of the display, or between the side of the display chassis and an outer plastic covering.
- the internal antenna 50 is not visible to the user of the wireless mobile device 20, but is nevertheless operational in this configuration.
- the antenna system 200 is described further in Figures 3, 4, and 5, below.
- the RF interconnection cable 24 is disposed behind the display 22 of the wireless device 20.
- dotted lines indicate one possible location of the RF interconnection cable 24 behind the display 22.
- the RF interconnection cable 24 is disposed between the back of the display 22 and an enclosure of the wireless device 20, such as a plastic covering.
- the RF interconnection cable 24 may be any of a variety of cabling, such as a coaxial cable or a twisted pair cable.
- the RF interconnection cable 24 is a Hirose coaxial cable.
- the antenna 70 of Figure 1 does not radiate successfully in the configuration shown in Figure 2, due to the decreased SNR caused by the proximity of the antenna element 72 and coaxial cable 76 to the sources of noise in the laptop computer. (although the antenna 70 is capable of receiving the intended signal, the receiver receives a substantially reduced signal, due to the noise, which is insufficient for processing. The effect is that the antenna 70, therefore, does not "work" in the laptop environment.) Two features of the antenna system 200 are distinguishable from that of the antenna 70. First, the antenna 50 in Figure 2 is a dipole antenna, which has no ground plane.
- a balun 40 is disposed between the antenna 50 and the RF interconnection cable 24, which keeps the cable from becoming a "third arm" of the dipole antenna and collecting noise from its surrounding environment.
- a balun 40 connects the antenna 50 to the RF interconnection cable 24, which is fed into a receiver, a transmitter, or a combination transmitter/receiver (not shown).
- a balun is a type of transformer that connects a balanced device to an unbalanced device.
- the word “balun” is a combination of the words “balanced” and "unbalanced”.
- a balanced line is one that has two conductors with equal currents in opposite directions. In other words, both conductors have the same voltage with respect to ground.
- a twisted pair cable is an example of a balanced line.
- An unbalanced line is one that includes one conductor and ground.
- a coaxial cable is a type of unbalanced line.
- the balun may convert an unbalanced signal to a balanced signal, or vice-versa.
- One of the applications of a balun is to connect a dipole antenna, which is balanced, to an unbalanced coaxial transmission line.
- the balun divides the signal from the coaxial cable into two equal signals to be transmitted on the two poles of the antenna.
- the balun also provides one of the two equal signals with a predetermined phase and the other of the equal signals with a 180-degree phase difference relative to the predetermined phase.
- the balun 40 is included with the internal antenna 50 to mitigate noise in the wireless mobile device 20.
- Experimental results show that the use of a balun with the antenna 50 substantially mitigates noise produced by the display of the wireless mobile device, in some embodiments.
- Figures 6 and 8, described in more detail below, demonstrate the extent of noise mitigation using the antenna system 200 within the wireless noise mitigation system 100.
- the wireless noise mitigation system 100 of Figure 2 utilizes different antennas 50 for different applications, in which the antennas are optimally selected according to the frequency range of the respective application.
- the wireless noise mitigation system 100 employs a balanced dipole antenna 5OA (Figure 3) for wireless internet connections and a balanced bowtie dipole antenna 5OB ( Figure 4) or 5OC ( Figure 5) for digital television (DTV) applications.
- the antennas 5OA, 5OB, and 5OC are collectively referred to herein as antennas 50; likewise, the baluns 4OA, 4OB, and 4OC are collectively referred to herein as baluns 40).
- the different antennas are optimally selected to operate at different frequencies.
- Wireless internet connections operate at a range between 2.4 and 2.48 GHz while digital televisions operate at between 470 and 862 MHz.
- Standard ultrahigh frequency (UHF) television signals operate in a range of 450 - 900 MHz.
- the wireless noise mitigation system 100 may thus be operable for a variety of frequency ranges.
- Antenna designers of ordinary skill in the art understand how adjustment of the arm lengths of the antenna relative to the wavelength of the intended signal may be achieved.
- FIG. 3 is a schematic diagram of a balanced dipole antenna system 200A to be used in the wireless noise mitigation system 100 for wireless internet connections, according to some embodiments.
- the antenna system 200A includes a balanced dipole antenna 5OA, a balun 4OA, and an RF interconnection cable (not shown).
- the balanced dipole antenna 5OA includes a left arm 32 and a right arm 34, for receiving a radio frequency (RF) signal from the air or for transmitting the RF signal to the air. Extending from the arms 32, 34 are connectors 36, 38, respectively, for connection to the balun 4OA.
- RF radio frequency
- the balun 4OA includes an unbalanced input (1 ) to be connected to the RF interconnection cable (not shown), and two balanced output signals (3, 4) to be connected to the connectors 36, 38 of the antenna 5OA.
- the signals received from the connectors 36, 38 are identical.
- the dipole antenna 5OA does not have a ground plane. Table 1 shows the terminal functions of the balun
- FIG 4 is a schematic diagram of balanced bowtie dipole antenna system 200B to be used in the wireless noise mitigation system 100 for digital television (DTV) applications, according to some embodiments.
- the antenna system 200B includes a balanced bowtie dipole antenna 5OB, a balun 4OB, and an RF interconnection cable (not shown).
- the balanced bowtie dipole antenna 5OB includes a left arm 52 and a right arm 54, for receiving a radio frequency (RF) signal from the air or for transmitting the RF signal to the air.
- RF radio frequency
- Extending from the antenna arms 62, 64 are microwave strip lines 56, 58, respectively, for connection to the balun 4OB.
- the balun 4OB includes asymmetric microstrip coupled lines 62 and 66 with quarter-wavelength single stub 64, both of which extend from microstrip line 56 to the left antenna arm 52 and microstrip line 58 to the right antenna arm 54, respectively.
- the upper asymmetric microstrip coupled line 62 has a connection of microstrip line with via hole 60 at its distal end, which connects the balun circuit to ground.
- the lower asymmetric microstrip coupled line 66 with an unbalanced input port 68 has a connection of a quarter wavelength single stub with a via hole 64, which connects the ground plane of the balun circuit, both of which extend from the microstrip line 56 and the antenna left arm 52.
- the signals received from both of the antenna arms 52, 54 to the extended microstrip lines 56, 58, respectively, are identical.
- the signals received from the antenna arms 52, 54 have the same magnitude, with 180 degrees out-of-phase in the presence of the balun 4OB.
- the unbalanced RF interconnection cable 24 is to be coupled to the unbalanced input port 68.
- the bowtie dipole antenna 5OB does not have a ground plane.
- the balun 4OB is manufactured on the same surface as the antenna 5OB. By manufacturing the antenna 5OB and the balun 4OB together, substantial cost savings may be realized over attaching an over-the-counter balun (see, e.g., Figure 5, below).
- the mobile noise mitigation system 100 may employ an antenna system 200C, according to some embodiments, as depicted in Figure 5.
- the antenna system 200C includes a dipole antenna 5OC, an off-the-shelf balun 4OC, and the RF interconnection cable (not shown).
- the dipole antenna 5OC may be used with the balun 4OC, such as when internal space for both the antenna and the microstrip line balun 4OB in Figure 4 are not available.
- the dipole antenna 5OC is preferred for DTV applications, in some embodiments, and the balun 4OC is commercially available.
- the wireless noise mitigation system 100 Figure 2
- the balanced ports 1 , 2 of the balun 4OC are each connected to one of the connectors 96, 98 of the antenna 5OC.
- the unbalanced port 3 of the balun 4OC is connected to the inner conductor of the RF interconnection cable 24 while the ground port 4 of the balun is connected to the outer conductor of the cable 24.
- Empirical measurements of the antenna system 200 as part of the wireless noise mitigation system 100 show striking improvement in noise mitigation using the dipole antennas 50 ( Figures 3, 4, and 5) with their respective baluns 40.
- Figure 6 for example, the performance of the unbalanced commercially available PIFA (not shown) is contrasted with the balanced dipole antenna 5OA ( Figure 3) in the mobile noise mitigation system 100 ( Figure 2).
- a graph 120 plots frequency (GHz) versus noise (dBm) for the measured noise in each antenna, where the antenna is operating in a mobile noise mitigation system 100 and the measurement is taken from the antenna integrated near the LCD display 22.
- the noise is measured in the frequency of 2.4 ⁇ 2.48 Gigahertz (GHz), as represented by the X-axis. (This is the frequency range for wireless internet connections.)
- the Y-axis is the measured noise level in decibels (referenced to milliwatts), or dBm. A lower noise level is preferred.
- a ceramic balun interface is used to provide 180 degrees out-of-phase in the balanced dipole antenna 5OA.
- Each antenna 5OA and 70 is fed with single hirose coaxial cable as the RF interconnection cable 24.
- the noise of the wireless mobile device 20 is measured with the antennas 5OA and 70 positioned in a number of different locations, with one of the samples resulting in the graph 120.
- the graph 120 shows that the balanced antenna 5OA lowers noise over the whole frequency range, with a maximum difference of four decibels (4 dB).
- the narrowband noise of the balanced antenna 5OA is decreased by up to 1 1 dB over the conventional antenna 70.
- Figure 7 show a noise measurement setup of the balanced antenna 5OC ( Figure 5) disposed in the mobile noise mitigation system 100 of Figure 2, according to some embodiments.
- the RF interconnection cable 24 is a single hirose cable, coupled between the antenna 5OC and a radio module. (Although not shown, the radio module is also internal to the laptop computer 20).
- a chamber 128 surrounds the laptop computer 20, shielding the antenna 5OC, the cable 24, and the laptop computer 20 from electromagnetic interference (EMI).
- EMI electromagnetic interference
- the hirose cable 24 is connected to an external coaxial cable 130 as shown. Platform noise is measured in the EMI shielding box 128 and is recorded in the spectrum analyzer 126.
- Figure 8 is a graph 140 showing the measured noise power for two different antennas over an ultra-high frequency (UHF) of 450 to 900 MHz, using the configuration of Figure 7.
- the graph 140 plots frequency (MHz) in the X- axis versus dBm in the Y-axis, which normalizes to milliwatts (0 dBm ⁇ 1 mW).
- a lower amount of noise power may be interpreted as a favorable radio operating condition, relative to a higher amount of noise power.
- the laptop 20 is turned on with Windows XP running during the measurements. (Windows XP is a product of Microsoft Corporation of Redmond, Washington.)
- the solid black plot represents the noise spectrum received from an integrated PIFA, such as the antenna 70 of Figure 1 .
- the middle darkly dotted plot is the measured noise spectrum from the antenna 70 when power to the LCD display 22 is turned off (but the laptop 20 is still on). There is a significant difference in the noise level when the LCD display 22 is turned on, which demonstrates the critical noise emission from LCD circuits.
- the lower lightly dotted plot shows the noise power measured with the dipole antenna 5OC with an over-the-counter balun as a balanced feeding when the LCD display 22 is turned on. Broadband noise is now decreased by more than 10 dB over the whole frequency band of interest and more than 20 dB improvement in narrowband interferences.
- the measured data is correlated with the measured data in 2.4 ⁇ 2.48 GHz, as shown in Figure 8.
- the graph 140 demonstrates that the balanced dipole antenna 5OC is mitigates noise in a wireless mobile device and may be extended to any frequency bands.
- the cost of the balanced dipole antennas 5OA, 5OB, and 5OC are comparable to the cost of the conventional PIFA antenna 70.
- the balanced dipole antennas 50 provide internal integration with low noise in the wireless mobile device.
- the antenna system 200 with the balanced dipole antenna 50 may be a useful low-cost solution for mitigating the platform noise to improve the wireless performance with minimum modification of the wireless mobile device.
- the antenna system 200 may be attractive in laptop and other mobile internet device (MID) platforms.
- OEMs Original equipment manufacturers
- the antenna system 200 increases the data throughput and range of the wireless communication significantly by decreasing the magnitude of platform noise at the antenna port of the wireless device.
- General approaches to mitigate the noise include the use of shielding, use of an adaptive clock, and reduction in the noise level of the platform of the mobile device.
- Use of the balanced dipole antenna 50 is cheaper and less complex than these alternative approaches.
- the antenna system 200 enables an internal digital TV antenna installation in the laptop computer with a good signal-to-noise ratio (SNR), providing good TV signal comparable or better than is obtainable using an external antenna configuration.
- SNR signal-to-noise ratio
- external antennas are used for DTV reception in laptop computers because of a high level of platform noise obtained by conventional unbalanced antennas.
- An external DTV antenna increases the cost and complexity of the laptop computer, which computer OEMs prefer to avoid.
- a noise mitigated embedded DTV antenna may be preferred by OEMs and wireless companies, due to the use of an internal antenna with low noise in the laptop configuration.
- the antenna system 200 increases the operational coverage area, such as DTV, wireless local area network (WLAN), and so on, by reducing the noise sensitivity of the receiver.
- An empirical study using the balanced dipole antenna 50 with DTV produces a signal strength of 90 dB uV/m at the rooftop level (10 m above ground), while the unbalanced internal antenna 70 picks up 15 dB of platform noise. This result explains why receiving a satisfactory signal at a given location in a cell (i.e., coverage probability) is likely to diminish from 100% to less than 50% when using the unbalanced internal antenna.
- the internal (embedded) dipole antenna 50 may be used for DTV, UHF, wireless internet, and other wireless technologies in the mobile platform.
- an embedded internal antenna may significantly increase user convenience while still allowing for an attractive industrial design.
- the capability of integrating digital TV antennas in the mobile platform chassis may be a significant differentiator for a laptop computer OEM.
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Details Of Aerials (AREA)
- Support Of Aerials (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Transceivers (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112008002228T DE112008002228T5 (en) | 2007-08-28 | 2008-08-22 | Platform noise reduction method using a balanced antenna |
GB1002379.4A GB2464073B (en) | 2007-08-28 | 2008-08-22 | Platform noise mitigation method using balanced antenna |
CN200880104465.4A CN101785196B (en) | 2007-08-28 | 2008-08-22 | Platform noise mitigation method using balanced antenna |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/845,785 | 2007-08-28 | ||
US11/845,785 US20090058751A1 (en) | 2007-08-28 | 2007-08-28 | Platform noise mitigation method using balanced antenna |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2009032555A2 true WO2009032555A2 (en) | 2009-03-12 |
WO2009032555A3 WO2009032555A3 (en) | 2009-05-28 |
Family
ID=40406642
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2008/073971 WO2009032555A2 (en) | 2007-08-28 | 2008-08-22 | Platform noise mitigation method using balanced antenna |
Country Status (5)
Country | Link |
---|---|
US (1) | US20090058751A1 (en) |
CN (1) | CN101785196B (en) |
DE (1) | DE112008002228T5 (en) |
GB (1) | GB2464073B (en) |
WO (1) | WO2009032555A2 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050264455A1 (en) * | 2004-05-26 | 2005-12-01 | Nokia Corporation | Actively tunable planar antenna |
KR100791117B1 (en) * | 2006-11-09 | 2008-01-02 | 주식회사 서비전자 | Control system for radio frequency transceiver and method thereof |
US8390530B2 (en) * | 2008-02-07 | 2013-03-05 | The Penn State Research Foundation | Method and apparatus for reduced coupling and interference between antennas |
TWI376055B (en) * | 2008-10-02 | 2012-11-01 | Ralink Technology Corp | Balanced pifa and method for manufacturing the same |
WO2011022101A2 (en) * | 2009-05-22 | 2011-02-24 | Arizona Board Of Regents, For And On Behalf Of Arizona State University | Flexible antennas and related apparatuses and methods |
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US6147653A (en) * | 1998-12-07 | 2000-11-14 | Wallace; Raymond C. | Balanced dipole antenna for mobile phones |
KR20020037258A (en) * | 2000-11-13 | 2002-05-18 | 가부시키가이샤 삼성 요코하마겐큐쇼 | Personal Hand Phone |
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US7126545B2 (en) * | 2002-02-15 | 2006-10-24 | Matsushita Electric Industrial Co., Ltd. | Antenna unit and portable radio system comprising antenna unit |
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JP3068502B2 (en) * | 1997-05-15 | 2000-07-24 | 静岡日本電気株式会社 | Wireless personal digital assistant |
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AU2001282546A1 (en) * | 2000-08-31 | 2002-03-13 | Matsushita Electric Industrial Co., Ltd. | Built-in antenna for radio communication terminal |
JP2002151939A (en) * | 2000-10-03 | 2002-05-24 | Internatl Business Mach Corp <Ibm> | Antenna system, information processing unit and mobile phone |
JP4138540B2 (en) * | 2003-03-12 | 2008-08-27 | 三菱電機株式会社 | Signal transmitter / receiver |
JP4104499B2 (en) * | 2003-06-30 | 2008-06-18 | 小島プレス工業株式会社 | Dual frequency antenna |
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2007
- 2007-08-28 US US11/845,785 patent/US20090058751A1/en not_active Abandoned
-
2008
- 2008-08-22 DE DE112008002228T patent/DE112008002228T5/en not_active Withdrawn
- 2008-08-22 CN CN200880104465.4A patent/CN101785196B/en not_active Expired - Fee Related
- 2008-08-22 GB GB1002379.4A patent/GB2464073B/en not_active Expired - Fee Related
- 2008-08-22 WO PCT/US2008/073971 patent/WO2009032555A2/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US6147653A (en) * | 1998-12-07 | 2000-11-14 | Wallace; Raymond C. | Balanced dipole antenna for mobile phones |
KR20020037258A (en) * | 2000-11-13 | 2002-05-18 | 가부시키가이샤 삼성 요코하마겐큐쇼 | Personal Hand Phone |
US7126545B2 (en) * | 2002-02-15 | 2006-10-24 | Matsushita Electric Industrial Co., Ltd. | Antenna unit and portable radio system comprising antenna unit |
KR20040051047A (en) * | 2002-12-11 | 2004-06-18 | 한국전기연구원 | Antenna covered or molded with insulating safety cover for detecting partial discharge, applied voltage and phase |
Also Published As
Publication number | Publication date |
---|---|
CN101785196A (en) | 2010-07-21 |
US20090058751A1 (en) | 2009-03-05 |
GB2464073A (en) | 2010-04-07 |
WO2009032555A3 (en) | 2009-05-28 |
GB201002379D0 (en) | 2010-03-31 |
GB2464073B (en) | 2012-06-06 |
DE112008002228T5 (en) | 2010-06-17 |
CN101785196B (en) | 2013-02-27 |
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